As you add more Fat Sacs, keep the weight distributed 60%-70% in the rear of the boat and 30%-40% in the front of the boat
Rule 3:
For Runabouts (I/O's) with open bows, add a Fat Sac to the center locker first, then as you gain more experience wakeboarding and desire a bigger wake, distribute additional Fat Sacs using Rule #2.
Rule 4:
To switch to wakesurfing, get some MORE Fat Sacs and add them to the rear and side of the boat all the way up to the front (on the side that you are wakesurfing on).